2 Copyright (C) 2003 Paul Davis
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 #ifndef __gtk_ardour_time_axis_view_item_h__
22 #define __gtk_ardour_time_axis_view_item_h__
24 #include <sigc++/signal.h>
26 #include <jack/jack.h>
29 #include <libgnomecanvasmm/text.h>
31 #include "selectable.h"
32 #include "simplerect.h"
38 * A base class for 'items' that may appear upon a TimeAxisView
41 class TimeAxisViewItem : public sigc::trackable, public Selectable
44 virtual ~TimeAxisViewItem() ;
47 * Set the position of this item upon the timeline to the specified value
49 * @param pos the new position
50 * @param src the identity of the object that initiated the change
51 * @return true if the position change was a success, false otherwise
53 virtual bool set_position(jack_nframes_t pos, void* src, double* delta = 0) ;
56 * Return the position of this item upon the timeline
58 * @return the position of this item
60 jack_nframes_t get_position() const ;
63 * Sets the duration of this item
65 * @param dur the new duration of this item
66 * @param src the identity of the object that initiated the change
67 * @return true if the duration change was succesful, false otherwise
69 virtual bool set_duration(jack_nframes_t dur, void* src) ;
72 * Returns the duration of this item
75 jack_nframes_t get_duration() const ;
78 * Sets the maximum duration that this item make have.
80 * @param dur the new maximum duration
81 * @param src the identity of the object that initiated the change
83 virtual void set_max_duration(jack_nframes_t dur, void* src) ;
86 * Returns the maxmimum duration that this item may be set to
88 * @return the maximum duration that this item may be set to
90 jack_nframes_t get_max_duration() const ;
93 * Sets the minimu duration that this item may be set to
95 * @param the minimum duration that this item may be set to
96 * @param src the identity of the object that initiated the change
98 virtual void set_min_duration(jack_nframes_t dur, void* src) ;
101 * Returns the minimum duration that this item mey be set to
103 * @return the nimum duration that this item mey be set to
105 jack_nframes_t get_min_duration() const ;
108 * Sets whether the position of this Item is locked to its current position
109 * Locked items cannot be moved until the item is unlocked again.
111 * @param yn set to true to lock this item to its current position
112 * @param src the identity of the object that initiated the change
114 virtual void set_position_locked(bool yn, void* src) ;
117 * Returns whether this item is locked to its current position
119 * @return true if this item is locked to its current posotion
122 bool get_position_locked() const ;
125 * Sets whether the Maximum Duration constraint is active and should be enforced
127 * @param active set true to enforce the max duration constraint
128 * @param src the identity of the object that initiated the change
130 void set_max_duration_active(bool active, void* src) ;
133 * Returns whether the Maximum Duration constraint is active and should be enforced
135 * @return true if the maximum duration constraint is active, false otherwise
137 bool get_max_duration_active() const ;
140 * Sets whether the Minimum Duration constraint is active and should be enforced
142 * @param active set true to enforce the min duration constraint
143 * @param src the identity of the object that initiated the change
145 void set_min_duration_active(bool active, void* src) ;
148 * Returns whether the Maximum Duration constraint is active and should be enforced
150 * @return true if the maximum duration constraint is active, false otherwise
152 bool get_min_duration_active() const ;
155 * Set the name/Id of this item.
157 * @param new_name the new name of this item
158 * @param src the identity of the object that initiated the change
160 void set_item_name(std::string new_name, void* src) ;
163 * Returns the name/id of this item
165 * @return the name/id of this item
167 virtual std::string get_item_name() const ;
170 * Set to true to indicate that this item is currently selected
172 * @param yn true if this item is currently selected
173 * @param src the identity of the object that initiated the change
175 virtual void set_selected(bool yn, void* src) ;
178 * Set to true to indicate that this item should show its selection status
180 * @param yn true if this item should show its selected status
182 virtual void set_should_show_selection (bool yn) ;
185 * Returns whether this item is currently selected.
187 * @return true if this item is currently selected, false otherwise
189 bool get_selected() const ;
191 //---------------------------------------------------------------------------------------//
192 // Parent Component Methods
195 * Returns the TimeAxisView that this item is upon
197 * @return the timeAxisView that this item is placed upon
199 TimeAxisView& get_time_axis_view() ;
201 //---------------------------------------------------------------------------------------//
205 * Sets the displayed item text
206 * This item is the visual text name displayed on the canvas item, this can be different to the name of the item
208 * @param new_name the new name text to display
210 void set_name_text(std::string new_name) ;
213 * Set the height of this item
215 * @param h the new height
217 virtual void set_height(double h) ;
222 void set_color(Gdk::Color& color) ;
227 ArdourCanvas::Item* get_canvas_frame() ;
232 ArdourCanvas::Item* get_canvas_group();
237 ArdourCanvas::Item* get_name_highlight();
242 ArdourCanvas::Text* get_name_text();
246 * Sets the samples per unit of this item.
247 * this item is used to determine the relative visual size and position of this item
248 * based upon its duration and start value.
250 * @param spu the new samples per unit value
252 virtual void set_samples_per_unit(double spu) ;
255 * Returns the current samples per unit of this item
257 * @return the samples per unit of this item
259 double get_samples_per_unit() ;
261 virtual void raise () { return; }
262 virtual void raise_to_top () { return; }
263 virtual void lower () { return; }
264 virtual void lower_to_bottom () { return; }
267 * returns true if the name area should respond to events.
269 bool name_active() const { return name_connected; }
271 // Default sizes, font and spacing
272 static Pango::FontDescription NAME_FONT ;
273 static bool have_name_font;
274 static const double NAME_X_OFFSET ;
275 static const double NAME_Y_OFFSET ;
276 static const double NAME_HIGHLIGHT_SIZE ;
277 static const double NAME_HIGHLIGHT_THRESH ;
278 static const double GRAB_HANDLE_LENGTH ;
281 * Handles the Removal of this time axis item
282 * This _needs_ to be called to alert others of the removal properly, ie where the source
283 * of the removal came from.
285 * XXX Although im not too happy about this method of doing things, I cant think of a cleaner method
286 * just now to capture the source of the removal
288 * @param src the identity of the object that initiated the change
290 virtual void remove_this_item(void* src) ;
293 * Emitted when this Group has been removed
294 * This is different to the GoingAway signal in that this signal
295 * is emitted during the deletion of this Time Axis, and not during
296 * the destructor, this allows us to capture the source of the deletion
299 sigc::signal<void,std::string,void*> ItemRemoved ;
301 /** Emitted when the name/Id of this item is changed */
302 sigc::signal<void,std::string,std::string,void*> NameChanged ;
304 /** Emiited when the position of this item changes */
305 sigc::signal<void,jack_nframes_t,void*> PositionChanged ;
307 /** Emitted when the position lock of this item is changed */
308 sigc::signal<void,bool,void*> PositionLockChanged ;
310 /** Emitted when the duration of this item changes */
311 sigc::signal<void,jack_nframes_t,void*> DurationChanged ;
313 /** Emitted when the maximum item duration is changed */
314 sigc::signal<void,jack_nframes_t,void*> MaxDurationChanged ;
316 /** Emitted when the mionimum item duration is changed */
317 sigc::signal<void,jack_nframes_t,void*> MinDurationChanged ;
319 /** Emitted when the selected status of this item changes */
320 sigc::signal<void, bool> Selected ;
327 ShowNameHighlight = 0x2,
333 * Constructs a new TimeAxisViewItem.
335 * @param it_name the unique name/Id of this item
336 * @param parent the parent canvas group
337 * @param tv the TimeAxisView we are going to be added to
338 * @param spu samples per unit
340 * @param start the start point of this item
341 * @param duration the duration of this item
343 TimeAxisViewItem(const std::string & it_name, ArdourCanvas::Group& parent, TimeAxisView& tv, double spu, Gdk::Color& base_color,
344 jack_nframes_t start, jack_nframes_t duration, Visibility v = Visibility (0));
347 * Calculates some contrasting color for displaying various parts of this item, based upon the base color
349 * @param color the base color of the item
351 virtual void compute_colors(Gdk::Color& color) ;
354 * convenience method to set the various canvas item colors
356 virtual void set_colors() ;
359 * Sets the frame color depending on whether this item is selected
361 void set_frame_color() ;
364 * Sets the colors of the start and end trim handle depending on object state
367 void set_trim_handle_colors() ;
369 virtual void reset_width_dependent_items (double pixel_width);
370 void reset_name_width (double pixel_width);
373 * Callback used to remove this item during the gtk idle loop
374 * This is used to avoid deleting the obejct while inside the remove_this_group
377 * @param item the time axis item to remove
378 * @param src the identity of the object that initiated the change
380 static gint idle_remove_this_item(TimeAxisViewItem* item, void* src) ;
382 /** The time axis that this item is upon */
383 TimeAxisView& trackview ;
385 /** indicates whether this item is locked to its current position */
386 bool position_locked ;
388 /** The posotion of this item on the timeline */
389 jack_nframes_t frame_position ;
391 /** the duration of this item upon the timeline */
392 jack_nframes_t item_duration ;
394 /** the maximum duration that we allow this item to take */
395 jack_nframes_t max_item_duration ;
397 /** the minimu duration that we allow this item to take */
398 jack_nframes_t min_item_duration ;
400 /** indicates whether this Max Duration constraint is active */
401 bool max_duration_active ;
403 /** indicates whether this Min Duration constraint is active */
404 bool min_duration_active ;
406 /** the curretn samples per canvas unit */
407 double samples_per_unit ;
409 /** indicates if this item is currently selected */
412 /** should the item show its selected status */
413 bool should_show_selection;
416 * The unique item name of this Item
417 * Each item upon a time axis must have a unique id
419 std::string item_name ;
422 * true if the name should respond to events
427 * true if a small vestigial rect should be shown when the item gets very narrow
432 uint32_t fill_opacity;
433 uint32_t fill_color ;
434 uint32_t frame_color_r ;
435 uint32_t frame_color_g ;
436 uint32_t frame_color_b ;
437 uint32_t selected_frame_color_r ;
438 uint32_t selected_frame_color_g ;
439 uint32_t selected_frame_color_b ;
440 uint32_t label_color ;
442 uint32_t handle_color_r ;
443 uint32_t handle_color_g ;
444 uint32_t handle_color_b ;
445 uint32_t lock_handle_color_r ;
446 uint32_t lock_handle_color_g ;
447 uint32_t lock_handle_color_b ;
449 ArdourCanvas::Group* group;
450 ArdourCanvas::SimpleRect* vestigial_frame;
451 ArdourCanvas::SimpleRect* frame;
452 ArdourCanvas::Text* name_text;
453 ArdourCanvas::SimpleRect* name_highlight;
454 ArdourCanvas::SimpleRect* frame_handle_start;
455 ArdourCanvas::SimpleRect* frame_handle_end;
457 }; /* class TimeAxisViewItem */
459 #endif /* __gtk_ardour_time_axis_view_item_h__ */